Method of making planished sheet-iron.



STATES PATEN FFIQE.

SAMUEL M. COOPER, OF MOKEE SPORT," PENNSYLVANIA, ASSIGNOR TO AMERICAN SHEET dz TIN PLATE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

METHOD OF MAKING PLANISHED SHEET-IRON.

Specification of Letters Patent.

Application filed November 21, 1908.

Patented April 20, 1909.

Serial No. 463,798.

To all whom it may concern:

Be it known that I, SAMUEL M. Coornn, of McKeesport, Allegheny county, Pennsylvania, have invented a new and useful Method of Making Planished Sheet-Iron, of which the following is a full, clear, and exact description.

My invention relates to the manufacture of planished sheet iron, which presents a mottled polished appearance in the finished sheets. Heretofore the common practice in producing this material has been to finish the packs of sheets in the ordinary manner and then produce indentations in the sheets by hammering them in sets of about a half a dozen sheets between dies which have a mottled surface. This hammering action not only mottles the sheets, but also polishes them. It has also been proposed to mottle the sheets by rolling after the sheets have been brought to substantially their finished gage and before they are hammered in plain ies. I

I have discovered that by machining the mottled surface on iron rolls made of a dense mixture of iron, I can reduce the sheets in packs immediately after matching and at the same time mottle the sheets; so that they may be hammered and polished between plain dies and an improved product ob,

tained. I have also found that by this improved method I can hammer and polish. a very much larger number of sheets than was heretofore possible; using about 60 to 75 sheets to the pack.

In carrying out my invention, I first roll the sheets singly and successively from the sheet bars in the ordinary manner, and I then form a pack of these sheets of usually from three to five in number, thesheets of the pack being reheated to the pro er tem erature. Previous to piling the rokenown pairs of sheet bars are preferably dipped in a solution of charcoaldust and water in order to revent the sheets from sticking in the pac s. When the packs of reheated sheets are prepared, they are reduced to the desired gage by successive passes through a single pair of mottle rolls. These mottle rolls are preferably prepared in accordance with the process described in my co-pending application Serial No. 463797 filed November 21st, l908-that is, the surface of these rolls is pock-marked by means of a steel-forming roller having raised projections upon it which .is forced against the surface of the iron roll.

The pack of three to five sheets when thus reduced in the mottle rolls will present a mottled appearance, the sheets of the pack are then taken apart, and the ends are sheared. The sheets are then pickled, and the partially reduced sheets are also preferably pickled prior to reheating and mottling. After pickling the mottled sheets, the dried sheets are then piled into packs of 60 to 7 5 in number. In this act of iling charcoal dust is also referably supplie between the sheets. The pi e is then preferably inclosed in loose sheets which are wired about the back as an envelop, extra cover sheets being su plied at the top and bottom of the pack. T e pack age is then putin a baking furnace and heated to the roper temperature and is then taken to the brooms. Each sheet is then broomed on both sides, and the pack is repiled and taken to the hammer dies for leveling. These dies act to flatten and level the sheets. The top and bottom cover sheets are retained on the pile and the pile is then reheated and taken to the hammers. These hammer dies have plain surfaces, and the pile is then hammered in the usual manner between these dies to polish the sheets.

The advantages of my invention result from the use of the pock-marked rolls for rolling the matched packs to their final gage; in connection with the polishing by smoothfaced hammers, I thereby secure economy in the process owing to the large number of sheets in the pile which may be hammered at the same time, and I also produce an improved product.

.Variations may be made in the form and "arrangement of the apparatus without departing from my inventlon.

' I claim 1. The method of making planished sheet iron, consisting in rolling singles on lain rolls, piling the sheets into packs, and milling the packs down to the deslred gage on mottled rolls hile in a heated condition, and then hammermg a plurality of the sheets be? tween lain dies; substantially as described.

2. 1 e method of making planished sheet iron, consisting in rolling singles on )lain rolls, piling the sheets intd'packs and 1'0 ling the packs down to the desired gage en mot tled rolls While in a heated condition, and

then repiling the sheets into piles of a larger l number and hammering the said piles of 10 sheets between plain dies; substantially as described.

In testimony whereof, I have hereunto set my hand.

SAMUEL M. COOPER. W tnesse J. H. RUILOBA, G. C. KIMBALL. 

